Twenty Nineteen: Add `border-radius` to avatar images in the editor.

This ensures that avatars design in the Post Author or Avatar blocks in the editor matches the front end.

Props pitamdey, shailu25, poena, sabernhardt, balub, sarath.ar, nicolefurlan, harshgajipara, pooja1210.
Fixes #59285.
Built from https://develop.svn.wordpress.org/trunk@57579


git-svn-id: http://core.svn.wordpress.org/trunk@57080 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-content/themes/twentynineteen/style-editor.css

@@ -1605,3 +1605,9 @@ ul.wp-block-archives li ul,
   padding-right: 0;
   width: 100%;
 }
+
+/** === Post Author Block === */
+.avatar,
+.wp-block-post-author__avatar img {
+  border-radius: 100%;
+}

wp-content/themes/twentynineteen/style-editor.scss

@@ -1021,3 +1021,10 @@ $group-block-background__padding: $font__size_base;
 		width: 100%;
 	}
 }
+
+/** === Post Author Block === */
+
+.avatar,
+.wp-block-post-author__avatar img {
+	border-radius: 100%;
+}

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57578';
+$wp_version = '6.5-alpha-57579';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.